Over-travel detection system and insulating draw rod thereof

The utility model discloses an insulating draw rod, which comprises a rod body, an elastic device arranged inside the rod body and a force sensor arranged inside the rod body, wherein the force sensor is provided with a signal output lead; and one end of the force sensor abuts against the elastic device. According to the insulating draw rod disclosed by the utility model, by adding the force sensor inside the insulating draw rod, when a circuit breaker operates, as one end of the force sensor abuts against the elastic device, the elastic device inside the insulating draw rod starts compression, the force sensor bears the force and generates voltage signals, the voltage signals are outputted to the detection device for detection via the signal output lead, and the measured over-travel value is compared with a preset value so as to judge whether over travel happens to the vacuum circuit breaker. The utility model further discloses an over-travel detection system provided with the above mentioned insulating draw rod.